PIC17C756AT-16/PT - 8-bit 16MHz 32KB OTP MCU 50 I/O | Microchip
MPN: PIC17C756AT-16/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.8 | $168.00 |
| 100 | $14.95 | $1,495.00 |
| 500 | $13.4 | $6,700.00 |
| 1,000 | $11.95 | $11,950.00 |
PIC17C756AT-16/PT Overview
Background: PIC microcontrollers (Peripheral Interface Controllers) are 8/16/32-bit RISC-based Harvard-architecture microcontrollers originally developed by General Instrument's microelectronics division and later popularized by Microchip Technology. The PIC17CXXX family was Microchip's first 8-bit architecture to exceed 16-bit core performance (with 16-bit instructions and an 8-bit data path), offering an upgrade path from the popular PIC16CXXX family. Within the broader taxonomy, PIC17 sits between the PIC16 (entry-level 8-bit) and PIC18 (high-performance 8-bit) families, and is positioned as the mid-tier for engineers needing more MIPS without migrating to 16-bit dsPIC devices.
Key features include a single-cycle hardware multiplier, 58 single-word instructions, hardware USART, MSSP (SPI/I2C), 10-bit A/D converter with multiple channels, and a multi-source interrupt controller. The 'A' suffix marks an enhanced silicon revision that adds peripheral improvements over the original PIC17C756 die, while the 'T' suffix denotes Tape & Reel packaging for high-volume assembly.
The device operates from 4.5 V to 5.5 V supply and supports an industrial temperature range, making it suitable for industrial control, instrumentation, and automotive subsystems (when properly qualified). The instruction set is fully upward-compatible with PIC16C5X/PIC12CXXX/PIC16CXXX devices, easing code migration within Microchip's 8-bit portfolio.
Typical applications include industrial automation controllers, motor control front-ends, sensor signal conditioning, and embedded control boards requiring USART-driven communication. Its 50 GPIO pins comfortably support keypad scanning, LCD driving, and parallel bus interfacing.
When designing with this part, verify OTP memory implications: OTP (One-Time-Programmable) cannot be erased, so code must be fully validated before programming. Use the PIC17C756A-16/PT for windowed (UV-erasable) development prototypes, then migrate to the 'T' suffix for production tape & reel assembly.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design guidance not assembled in the manufacturer datasheet alone.
Drop-in alternatives for PIC17C756AT-16/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC17C756AT-16/PT (same form factor and footprint) — differing in Operating Temperature, Package, Data Bus Width, ADC, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C756A-16/PT
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →PIC17C756A-16I/PT
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →PIC17C756A-16E/PT
✅ Drop-In✓ In Stock
$16.8 / Unit
View Datasheet →PIC17C756A-33E/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC17C752-16E/PT
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →PIC17C752-33/PT
✅ Drop-In✓ In Stock
$10.1 / Unit
View Datasheet →PIC17C756AT-16/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (Harvard, RISC) |
| Family | PIC17CXXX |
| Program Memory Type | OTP (EPROM-based) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Maximum Clock Frequency | 16 MHz |
| Instruction Cycle | 121 ns (single cycle) |
| Performance | 8.25 MIPS |
| Data Bus Width | 16-bit (instruction) / 8-bit (data path) |
| Supply Voltage | 4.5 V to 5.5 V |
| I/O Pins | 50 |
| A/D Converter | 10-bit |
| Communication Interfaces | USART, SPI, I2C (MSSP) |
| Hardware Multiplier | Yes (single-cycle 8x8) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lifecycle | Not Recommended for New Designs (NRND) |
| Instruction Set Size | 58 single-word instructions |
PIC17C756AT-16/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input |
| Pin 2 | OSC1 — Oscillator input / external clock |
| Pin 3 | OSC2 — Oscillator output |
| Pin 4 | RA0/AN0 — Digital I/O / analog channel 0 |
| Pin 5 | RA1/AN1 — Digital I/O / analog channel 1 |
| Pin 6 | RA2/AN2 — Digital I/O / analog channel 2 |
| Pin 7 | RA3/AN3 — Digital I/O / analog channel 3 |
| Pin 8 | RA4/AN4 — Digital I/O / analog channel 4 |
| Pin 9 | RA5/AN5 — Digital I/O / analog channel 5 |
| Pin 10 | RA6 — Digital I/O |
| Pin 11 | RA7 — Digital I/O |
| Pin 12 | VSS — Ground reference |
| Pin 13 | VDD — Positive supply (5V) |
| Pin 14 | RB0/INT — Digital I/O / external interrupt |
| Pin 15 | RB1 — Digital I/O |
| Pin 16 | RB2 — Digital I/O |
| Pin 17 | RB3 — Digital I/O |
| Pin 18 | RB4 — Digital I/O |
| Pin 19 | RB5 — Digital I/O |
| Pin 20 | RB6 — Digital I/O |
| Pin 21 | RB7 — Digital I/O |
| Pin 22 | RC0 — Digital I/O |
| Pin 23 | RC1 — Digital I/O |
| Pin 24 | RC2 — Digital I/O |
| Pin 25 | RC3 — Digital I/O |
| Pin 26 | RC4 — Digital I/O |
| Pin 27 | RC5 — Digital I/O |
| Pin 28 | RC6 — Digital I/O |
| Pin 29 | RC7 — Digital I/O |
| Pin 30 | RD0 — Digital I/O |
| Pin 31 | RD1 — Digital I/O |
| Pin 32 | RD2 — Digital I/O |
| Pin 33 | RD3 — Digital I/O |
| Pin 34 | RD4 — Digital I/O |
| Pin 35 | RD5 — Digital I/O |
| Pin 36 | RD6 — Digital I/O |
| Pin 37 | RD7 — Digital I/O |
| Pin 38 | VSS — Ground reference |
| Pin 39 | VDD — Positive supply (5V) |
| Pin 40 | RE0/RD — Digital I/O / parallel bus read strobe |
| Pin 41 | RE1/WR — Digital I/O / parallel bus write strobe |
| Pin 42 | RE2/CS — Digital I/O / chip select |
| Pin 43 | RE3 — Digital I/O |
| Pin 44 | RE4 — Digital I/O |
| Pin 45 | RE5 — Digital I/O |
| Pin 46 | RE6 — Digital I/O |
| Pin 47 | RE7 — Digital I/O |
| Pin 48 | RF0 — Digital I/O |
| Pin 49 | RF1 — Digital I/O |
| Pin 50 | RF2 — Digital I/O |
| Pin 51 | RF3 — Digital I/O |
| Pin 52 | RF4 — Digital I/O |
| Pin 53 | RF5 — Digital I/O |
| Pin 54 | RF6 — Digital I/O |
| Pin 55 | RF7 — Digital I/O |
| Pin 56 | RG0 — Digital I/O |
| Pin 57 | RG1 — Digital I/O |
| Pin 58 | RG2 — Digital I/O |
| Pin 59 | RG3 — Digital I/O |
| Pin 60 | RG4 — Digital I/O |
| Pin 61 | VSS — Ground reference |
| Pin 62 | VDD — Positive supply (5V) |
| Pin 63 | AVSS — Analog ground |
| Pin 64 | AVDD — Analog supply (5V) |
Typical Applications
PIC17C756AT-16/PT is suitable for 6 applications: Industrial Automation Controllers, Motor Control Front-Ends, Sensor Signal Conditioning & Acquisition, Embedded Control Boards with USART Communication, Keypad / LCD Interface Panels, Legacy Maintenance & Replacement Designs.
Industrial Automation Controllers
The PIC17C756AT-16/PT fits industrial automation controllers because its 50 GPIO pins and 8.25 MIPS throughput comfortably drive relay matrices, encoder inputs, and HMI keypads simultaneously. The integrated USART handles RS-232/RS-485 host links while the MSSP supports SPI-based ADC front-ends for analog sensor acquisition. With 4.5-5.5V operation matching legacy 5V PLC backplanes and 902 bytes of RAM for command queuing, the device replaces discrete logic in conveyor and motor-start panels.
Recommended
Motor Control Front-Ends
The PIC17C756AT-16/PT serves motor control front-ends via its 10-bit A/D converter sampling phase currents at rates compatible with the 121 ns instruction cycle, plus its hardware multiplier enabling fast lookup-table-based sine generation. The 50 GPIO pins drive six PWM channels directly through software, suitable for BLDC and stepper control at moderate speeds. For higher-end vector control, migrate to dsPIC33EP64MC504 which adds dedicated PWM and encoder peripherals.
Recommended
Sensor Signal Conditioning & Acquisition
Sensor signal conditioning benefits from PIC17C756AT-16/PT's 10-bit A/D with multiple channels and 902-byte RAM for sample buffering, supporting multi-sensor data loggers at moderate rates. The MSSP SPI interface streams digitized sensor data to external 16/24-bit ADCs for precision measurements. Industrial temperature grade operation ensures reliable acquisition in factory environments with electrical noise.
Recommended
Embedded Control Boards with USART Communication
The PIC17C756AT-16/PT's hardware USART enables reliable RS-232/RS-485 communication with embedded control boards, while its 32 KB OTP memory holds protocol stacks for Modbus RTU or proprietary master-slave networks. The 50 GPIO handle multi-drop enable lines, status LEDs, and user interfaces without external bus expanders. Drop-in upgrade path to PIC17C756A-33E/PT doubles throughput for higher baud-rate industrial networks.
Recommended
Keypad / LCD Interface Panels
Human-machine interface panels benefit from PIC17C756AT-16/PT's 50 GPIO pins, which directly scan 8x8 matrix keypads while driving character LCDs and status LED arrays in parallel. The 902 bytes of RAM store menu navigation buffers and the 32 KB OTP holds character libraries. Migration to PIC16LF727-I/ML for low-power LCD panels is straightforward using the PIC16 compatible instruction subset.
Recommended
Legacy Maintenance & Replacement Designs
PIC17C756AT-16/PT is primarily used today for legacy maintenance of installed industrial equipment, where replacing an entire controller is more expensive than sourcing an exact-match replacement. Its NRND status means Microchip has qualified PIC18F6520 as the migration path, but installed PIC17C756 codebases often depend on PIC17-specific instruction timing and bank structure. Sourcing 16 MHz PIC17C756A-16I/PT or PIC17C756A-16E/PT maintains electrical equivalence while offering broader distributor stock.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756AT-16/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756A-16/PT | PIC17C756A-16I/PT | PIC17C756A-16E/PT | PIC17C756A-33E/PT | PIC17C752-16E/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz | 16 MHz |
| Program Memory | 32 KB (16K x 16) OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 16 KB OTP |
| RAM Size | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 678 bytes |
| I/O Pins | 50 | 50 | 50 | 50 | 50 | 50 |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Extended | Extended | Extended |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
| Tape & Reel Packaging | Yes (T suffix) | Tray (no T suffix) | Tray | Tray | Tray | Tray |
Key Differentiators
- Tape & Reel packaging for high-volume SMT (vs PIC17C756A-16/PT)
- Industrial temperature grade operation (vs PIC17C756A-16E/PT)
- Original PIC17 enhanced silicon revision (vs PIC17C756-16/PT (pre-A))
Design Notes
The PIC17C756AT-16/PT requires a stable 5V supply within 4.5-5.5V; use a 100 nF decoupling capacitor close to each VDD/VSS pair and a bulk 10 uF tantalum at the regulator output. Brown-out reset is recommended for industrial environments where supply transients may drop below 4.5V. Avoid switching the regulator near the OSC1 pin to prevent clock jitter.
PIC17C756AT-16/PT uses OTP (One-Time-Programmable) EPROM memory that cannot be erased after programming - validate code completely in a windowed PIC17C756A-16/JW prototype before committing to OTP. The 'A' silicon revision changes some peripheral register behaviors compared to the original PIC17C756 die; review the PIC17C7XX errata document before code reuse.
Route the TQFP-64 land pattern with 0.5 mm pitch and follow IPC-7351 nominal land recommendations. Keep traces under the package short and avoid running noisy signal lines beneath the IC. Provide a ground pour under the device with stitching vias around the perimeter for thermal dissipation and EMI reduction.
The 10-bit A/D converter achieves specified accuracy only when the analog supply AVDD/AVSS are properly decoupled - place 100 nF ceramic + 10 uF tantalum directly at pins 63/64. Long analog traces should be guarded by ground pours; if sampling high-impedance sources, add an external op-amp buffer to prevent ADC acquisition-time errors.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this part targets industrial rather than automotive applications. Lifecycle status NRND.
